condition mean min max ZT0-3 11.648949 11.648949 11.648949 ZT4-7 11.9740655 11.9740655 11.9740655 ZT8-11 12.285308 12.285308 12.285308 ZT12-15 12.5070065 12.5070065 12.5070065 ZT16-19 14.763607499999999 14.763607499999999 14.763607499999999 ZT20-23 12.8989655 12.8989655 12.8989655